Kim Jong-un

North Korean leader Kim Jong Un reviewed powerful missiles developed to launch nuclear strikes on the U.S. mainland.

State media photos showed Kim smiling widely and waving from a balcony toward troops and spectators at Kim Il Sung Square.

North Korea sees regular military drills between South Korea and the United States as an invasion rehearsal.

North Korea said Friday that leader Kim Jong Un called for stronger capability to cope with any foreign provocation.

Since April, Kim Jong Un and South Korean President Moon Jae-in exchanged personal letters several times.

The account comes from CNN's review of Bob Woodward's upcoming book, "Rage."

Small-scale exercises with South Korea have kept U.S. troops ready for conflict with North Korea, defense officials say.

The action followed reports that North Korea had warned of a possible missile launch or nuclear test for late December.

"There is no prospect of denuclearization until North Korea identifies its facilities and the location of its arsenal."

Pyongyang has stopped nuclear testing but officials say there is no evidence that nuclear stockpiles are decreasing.